$z=3.273$射电亮引力透镜MG B2016+112中致密双活动星系核的MUSE光谱研究
MUSE spectroscopy of the compact dual AGN in the $z=3.273$ radio-loud gravitational lens MG B2016+112
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中文总结 AI 辅助
该研究利用MUSE光谱证实了z=3.273处最紧凑的双活动星系核MG B2016+112，通过发射线拟合给出SMBH质量下限和爱丁顿比值，为双AGN提供了独立光谱证据。
中文摘要 AI 辅助
双活动星系核（AGN）是研究星系合并如何触发超大质量黑洞（SMBHs）吸积的独特实验室。然而，在红移$z>1$处，仅有少数双AGN在两个SMBH的投影间距$\gtrsim$ 1 kpc下得到确认。我们展示了射电亮系统MG B2016+112的三个分辨透镜像的存档MUSE光谱。在z = 3.273且投影间距为175 pc处，这是z > 1下最紧凑的已确认双AGN。在修正了$z \sim 0$处的ISM吸收后，我们在像A$--$C中探测到Ly$\alpha$、C IV、N V、He II和C III]发射。我们发现Ly $\alpha$、C IV、N V谱线在$z \sim 3.27$处受到饱和吸收的影响。He II / C III]发射线比值在像A和B之间一致，但与像C显著不同。我们通过允许最多两个高斯分量来拟合像A$--$C的C IV发射区，并使用宽分量来给出各自SMBH质量的下限：$\gtrsim 2 \times {10}^{7} M_\odot$、$\gtrsim 2.3 \times {10}^{7} M_\odot$和$\gtrsim 1.5 \times {10}^{7} M_\odot$。修正其强透镜放大率后，对应的爱丁顿比值分别为$\lesssim$ 0.47、0.51和0.04。结合先前的VLBI和X射线分析，我们的结果为MG B2016+112拥有两个AGN提供了强有力的独立光谱证据。我们的发现激励了深层的、空间分辨的近红外光谱研究，以独立地重新审视我们的质量估计并确定宿主星系的物理条件，该星系可能经历了一次重大合并。
英文摘要
Dual active galactic nuclei (AGN) are unique laboratories for studying how galaxy mergers trigger accretion onto supermassive black holes (SMBHs). However, at redshifts $z>1$, only few dual AGN are confirmed at projected separations $\gtrsim$ 1 kpc for the two SMBHs. We present archival MUSE spectroscopy of the three resolved lensed images of the radio-loud system MG B2016+112. At z = 3.273 and at a projected separation of 175 pc, this the most compact confirmed dual AGN at z > 1. We detect Ly$α$, C IV, N V, He II, and C III] emission across images A$--$C after correcting for ISM absorption at $z \sim 0$. We find that the Ly $α$, C IV, N V lines are affected by saturated absorption at $z \sim 3.27$. The He II / C III] emission-line ratios are consistent between images A and B but differ significantly from image C. We fit the C IV emission regions of images A$--$C by allowing for up to two Gaussians and use broad component to place lower limits on their respective SMBH masses: $\gtrsim 2 \times {10}^{7} M_\odot$, $\gtrsim 2.3 \times {10}^{7} M_\odot$, and $\gtrsim 1.5 \times {10}^{7} M_\odot$. Correcting for their strong lensing magnifications suggests Eddington ratios of $\lesssim$ 0.47, 0.51, and 0.04, respectively. Together with previous VLBI and X-ray analyses, our results provide strong, independent spectroscopic evidence that MG B2016+112 hosts two AGN. Our findings motivate deep, spatially resolved near-IR spectroscopy to independently revisit our mass estimates and determine the physical conditions of the host galaxy, which has likely undergone a major merger.
发表机构
- Nanjing University（南京大学）
- University of South Carolina（南卡罗来纳大学）
- University of Maryland Baltimore County（马里兰大学巴尔的摩县分校）
- School of Physics and Astronomy, University of Southampton（南安普顿大学物理与天文学院）
- Department of Physics, Astrophysics, University of Oxford（牛津大学物理、天体物理系）
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